Add TLS support to increment command (dgraph-io#3257)

* Fix dgraph increment options.

* Show error if TLS options are incomplete.

* Use TLS connection with dgraph increment if requested.

* Replace hard-coded alpha port in tests with z.SockAddr.

* Remove unnecessary comment.

dgraph/cmd/counter/increment.go

@@ -31,7 +31,6 @@ import (
 	"github.com/dgraph-io/dgraph/x"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
-	"google.golang.org/grpc"
 )
 
 var Increment x.SubCommand
@@ -49,12 +48,15 @@ func init() {
 	flag := Increment.Cmd.Flags()
 	flag.String("addr", "localhost:9080", "Address of Dgraph alpha.")
 	flag.Int("num", 1, "How many times to run.")
-	flag.Bool("ro", false, "Only read the counter value, don't update it.")
-	flag.Bool("be", false, "Read counter value without retrieving timestamp from Zero.")
 	flag.Duration("wait", 0*time.Second, "How long to wait.")
-	flag.String("pred", "counter.val", "Predicate to use for storing the counter.")
 	flag.String("user", "", "Username if login is required.")
 	flag.String("password", "", "Password of the user.")
+	flag.String("pred", "counter.val",
+		"Predicate to use for storing the counter.")
+	flag.Bool("ro", false,
+		"Read-only. Read the counter value without updating it.")
+	flag.Bool("be", false,
+		"Best-effort. Read counter value without retrieving timestamp from Zero.")
 	// TLS configuration
 	x.RegisterClientTLSFlags(flag)
 }
@@ -135,14 +137,17 @@ func run(conf *viper.Viper) {
 	waitDur := conf.GetDuration("wait")
 	num := conf.GetInt("num")
 
-	conn, err := grpc.Dial(addr, grpc.WithInsecure())
+	tlsCfg, err := x.LoadClientTLSConfig(conf)
+	x.CheckfNoTrace(err)
+
+	conn, err := x.SetupConnection(addr, tlsCfg, false)
 	if err != nil {
 		log.Fatal(err)
 	}
 	dc := api.NewDgraphClient(conn)
 	dg := dgo.NewDgraphClient(dc)
 	if user := conf.GetString("user"); len(user) > 0 {
-		x.Check(dg.Login(context.Background(), user, conf.GetString("password")))
+		x.CheckfNoTrace(dg.Login(context.Background(), user, conf.GetString("password")))
 	}
 
 	for num > 0 {

tlstest/acl/acl_over_tls_test.go

@@ -9,6 +9,7 @@ import (
 
 	"github.com/dgraph-io/dgo"
 	"github.com/dgraph-io/dgo/protos/api"
+	"github.com/dgraph-io/dgraph/z"
 	"github.com/golang/glog"
 	"github.com/spf13/viper"
 	"google.golang.org/grpc"
@@ -98,7 +99,7 @@ func ExampleLoginOverTLS() {
 	conf.Set("tls_cacert", "../tls/ca.crt")
 	conf.Set("tls_server_name", "node")
 
-	dg, err := dgraphClientWithCerts(":9180", conf)
+	dg, err := dgraphClientWithCerts(z.SockAddr, conf)
 	if err != nil {
 		glog.Fatalf("Unable to get dgraph client: %v", err)
 	}

tlstest/certrequest/certrequest_test.go

@@ -11,7 +11,7 @@ import (
 )
 
 func TestAccessOverPlaintext(t *testing.T) {
-	dg := z.DgraphClient(":9180")
+	dg := z.DgraphClient(z.SockAddr)
 	err := dg.Alter(context.Background(), &api.Operation{DropAll: true})
 	require.Error(t, err, "The authentication handshake should have failed")
 }
@@ -21,7 +21,7 @@ func TestAccessWithCaCert(t *testing.T) {
 	conf.Set("tls_cacert", "../tls/ca.crt")
 	conf.Set("tls_server_name", "node")
 
-	dg, err := z.DgraphClientWithCerts(":9180", conf)
+	dg, err := z.DgraphClientWithCerts(z.SockAddr, conf)
 	require.NoError(t, err, "Unable to get dgraph client: %v", err)
 	err = dg.Alter(context.Background(), &api.Operation{DropAll: true})
 	require.NoError(t, err, "Unable to perform dropall: %v", err)

tlstest/certrequireandverify/certrequireandverify_test.go

@@ -15,7 +15,7 @@ func TestAccessWithoutClientCert(t *testing.T) {
 	conf.Set("tls_cacert", "../tls/ca.crt")
 	conf.Set("tls_server_name", "node")
 
-	dg, err := z.DgraphClientWithCerts(":9180", conf)
+	dg, err := z.DgraphClientWithCerts(z.SockAddr, conf)
 	require.NoError(t, err, "Unable to get dgraph client: %v", err)
 	err = dg.Alter(context.Background(), &api.Operation{DropAll: true})
 	require.Error(t, err, "The authentication handshake should have failed")
@@ -28,7 +28,7 @@ func TestAccessWithClientCert(t *testing.T) {
 	conf.Set("tls_cert", "../tls/client.acl.crt")
 	conf.Set("tls_key", "../tls/client.acl.key")
 
-	dg, err := z.DgraphClientWithCerts(":9180", conf)
+	dg, err := z.DgraphClientWithCerts(z.SockAddr, conf)
 	require.NoError(t, err, "Unable to get dgraph client: %v", err)
 	err = dg.Alter(context.Background(), &api.Operation{DropAll: true})
 	require.NoError(t, err, "Unable to perform dropall: %v", err)

tlstest/certverifyifgiven/certverifyifgiven_test.go

@@ -15,7 +15,7 @@ func TestAccessWithoutClientCert(t *testing.T) {
 	conf.Set("tls_cacert", "../tls/ca.crt")
 	conf.Set("tls_server_name", "node")
 
-	dg, err := z.DgraphClientWithCerts(":9180", conf)
+	dg, err := z.DgraphClientWithCerts(z.SockAddr, conf)
 	require.NoError(t, err, "Unable to get dgraph client: %v", err)
 	err = dg.Alter(context.Background(), &api.Operation{DropAll: true})
 	require.NoError(t, err, "Unable to perform dropall: %v", err)
@@ -28,7 +28,7 @@ func TestAccessWithClientCert(t *testing.T) {
 	conf.Set("tls_cert", "../tls/client.acl.crt")
 	conf.Set("tls_key", "../tls/client.acl.key")
 
-	dg, err := z.DgraphClientWithCerts(":9180", conf)
+	dg, err := z.DgraphClientWithCerts(z.SockAddr, conf)
 	require.NoError(t, err, "Unable to get dgraph client: %v", err)
 	err = dg.Alter(context.Background(), &api.Operation{DropAll: true})
 	require.NoError(t, err, "Unable to perform dropall: %v", err)

x/tls_helper.go

@@ -53,7 +53,8 @@ type TLSHelperConfig struct {
 }
 
 func RegisterClientTLSFlags(flag *pflag.FlagSet) {
-	flag.String("tls_cacert", "", "The CA Cert file used to verify server certificates.")
+	flag.String("tls_cacert", "",
+		"The CA Cert file used to verify server certificates. Required for enabling TLS.")
 	flag.Bool("tls_use_system_ca", true, "Include System CA into CA Certs.")
 	flag.String("tls_server_name", "", "Used to verify the server hostname.")
 	flag.String("tls_cert", "", "(optional) The Cert file provided by the client to the server.")
@@ -107,6 +108,14 @@ func LoadClientTLSConfig(v *viper.Viper) (*tls.Config, error) {
 		}
 
 		return &tlsCfg, nil
+	} else
+	// Attempt to determine if user specified *any* TLS option. Unfortunately and contrary to
+	// Viper's own documentation, there's no way to tell whether an option value came from a
+	// command-line option or a built-it default.
+	if v.GetString("tls_server_name") != "" ||
+		v.GetString("tls_cert") != "" ||
+		v.GetString("tls_key") != "" {
+		return nil, fmt.Errorf("--tls_cacert is required for enabling TLS")
 	}
 	return nil, nil
 }